This is a new anglerfish linocut print and you'll notice the gradient effect, which is done with a blended (rainbow) roll of the relief printmaking ink. The lino print is now available in my Etsy shop. This short video shows the technique I used for inking up the linoleum block with the blended roll.
The initial idea for the deep sea print came from my son (and Octonauts superfan) who wanted me to design a new shirt for him and here you can see me printing the block printed t-shirt. I used Gamblin's Drive By Black Textile Ink - a good option for printing on fabric.